(19)
(11) EP 0 568 966 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.04.1994 Bulletin 1994/15

(43) Date of publication A2:
10.11.1993 Bulletin 1993/45

(21) Application number: 93107181.5

(22) Date of filing: 03.05.1993
(51) International Patent Classification (IPC)5: G11B 5/31
(84) Designated Contracting States:
DE FR GB NL

(30) Priority: 04.05.1992 US 878226

(71) Applicant: READ-RITE CORPORATION
Milpitas California 95035 (US)

(72) Inventors:
  • Nepela, Daniel A.
    San Jose, CA 95123 (US)
  • Cheng, Shih-Cheng
    Milpitas, CA 95035 (US)
  • Valstyn, Erich P.
    Los Gatos, CA 95030 (US)
  • Williams, Edgar M.
    Palo Alto, CA 94301 (US)
  • Bischoff, Peter G.
    Cupertino, CA 95014 (US)

(74) Representative: Körber, Wolfhart, Dr.rer.nat. et al
Patentanwälte Mitscherlich & Partner, Postfach 33 06 09
80066 München
80066 München (DE)


(56) References cited: : 
   
       


    (54) Thin film magnetic heads with multiple yokes


    (57) A thin film magnetic head is fabricated with a multiplicity of magnetic yokes (10,12,14,16) that interact effectively with an electrical coil (18). The magnetic P1 and P2 pole sections of the yoke are very narrow and form closely spaced envelopes about the coil. The multiple yokes are inductively linked to the coil so as to provide an increased number of flux interactions for a given length of coil turn. With this magnetic head design, signal output is increased, thermal noise is reduced, and the signal-to-noise ratio is effectively improved.






    Search report